K & J - in my S & B, we've got a side by side GE fridge. The drain hole is in the freezer side, under the bottom basket or tray slide. It drains to an evaporation tray under the fridge. I can only relay what happened to ours. Not sure if you may have the same or similar problem going on.
We would experience a small puddle of water on the floor on the freeze side on occasion. By pulling the basket/tray, I could carefully chip a small build up of ice that had built up. Then take a turkey baster and squirt hot water down the drain hole. This had happened off and on for a few years. Last year, we had our whole fridge noticeably warmer (ice cream not fully frozen, and the refrigerator side not getting as cool as it should).
A tech had to replace a thermometer/sensor on the back wall of the freezer. That part would have been simple except the whole condenser/freezer unit had a full block of ice build up. That necessitated us removing all the contents on both sides and finding alternative short term storage while the fridge defrosted. Took 24hrs to defrost but has worked flawlessly since.
Again, don't know if you have this issue but....